Smithy - You may be able to find one like this one - Mario Batali 10.5" Reversible Grill Pan and Griddle (without handles and oven-safe). Would that size fit in your trailer oven?
Edited to add that I think your pita bread looks absolutely wonderful and that sandwich makes me very hungry! That kind of cooking/baking is the sort of thing I used to attempt years ago while camping but the outcomes were not always as successful as yours usually are. You inspire me.